chainer.functions.tanh

chainer.functions.tanh(x)[source]

Elementwise hyperbolic tangent function.

\[f(x)=\tanh(x).\]
Parameters:x (Variable or numpy.ndarray or cupy.ndarray) – Input variable. A \((s_1, s_2, ..., s_N)\)-shaped float array.
Returns:Output variable. A \((s_1, s_2, ..., s_N)\)-shaped float array.
Return type:Variable

Example

>>> x = np.arange(-1, 4, 2).astype(np.float32)
>>> x
array([-1.,  1.,  3.], dtype=float32)
>>> F.tanh(x).array
array([-0.7615942,  0.7615942,  0.9950548], dtype=float32)